Add missing build tools.

Author: ayla

.gitignore

@@ -3,4 +3,3 @@ bjam*
 bootstrap.log
 tools/build/v2/engine/bin.*
 tools/build/v2/engine/bootstrap
-tools/build/src

CMakeLists.txt

@@ -61,7 +61,7 @@ if(BUILD_PYTHON)
     endif()
     include(${SCI_PYTHON_USE_FILE})
   else()
-    message(FATAL_ERROR "Python  library is required to compile Boost when BUILD_PYTHON is on.")
+    message(FATAL_ERROR "Python library is required to compile Boost when BUILD_PYTHON is on.")
   endif()
 endif()